declare, begin, or see active service in a war
宣战，进入战争状态；从军作战
(archaic)serve as a soldier
(古)当兵
(informal)have been hurt or injured
(非正式)受过伤
a threatening situation of instability in international relations
战争阴云，国际紧张局势
the war clouds were looming.
国际紧张局势迫在眉睫。
a prolonged war or period of conflict during which each side seeks to gradually wear out the other by a series of small-scale actions
消耗战
a prolonged debate conducted by means of the spoken or printed word
唇枪舌剑
a war, especially the First World War, regarded as making subsequent wars unnecessary
结束所有战争的战争（尤指第一次世界大战）
In an active state of conflict or contention.
处于交战状态：处于一种冲突或争论的活跃状态